Isolated DC to Single-phase AC Converter with Active Power Decoupling Capability for Battery Storage System

This paper proposes a new active power decoupling topology circuit, which does not require any additional passive components and switching devices for battery storage systems. This converter operates as the bidirectional isolated DC to single-phase AC converter with the power decoupling capability using the coupled inductor. The pulse density modulation (PDM), which achieves zero voltage switching (ZVS) is applied for the secondary side converter using a matrix converter (MC) in order to reduce the switching losses. This paper mentioned that the proposed circuit reduces the double-line frequency power ripple on the input current to 10.3 % by the experiment. In addition, the output voltage THD is lower than 3.0% overwide load range.